#include <at89c51RC2.h>
#include <intrins.h>

void Delay1ms(unsigned int xms)		//@11.0592MHz
{
	unsigned char i, j;
	while(xms)
	{
		_nop_();
		_nop_();
		_nop_();
		i = 11;
		j = 190;
		do
		{
			while (--j);
		} while (--i);
		xms--;
	}
}

void main()
{
	
	unsigned char LEDNum=0;
	P2=0xfe;
	while(1)
	{
		
		if(P3_1==0)
		{
			Delay1ms(20);
			while(P3_1==0);
			Delay1ms(20);
			LEDNum++;
			if(LEDNum==8)
				LEDNum=0;
			P2=~(0x01<<LEDNum);
		}
		if(P3_0==0)
		{
			Delay1ms(20);
			while(P3_0==0);
			Delay1ms(20);
			if(LEDNum==0)
				LEDNum=7;
			else
				LEDNum--;
			P2=~(0x01<<LEDNum);
			
		}
	}
}
